Incandescent electric lamp



(No Model.)

G. W. WILSON. V INOANDBSGENT ELECTRIC LAMP.

No. 414,741; Patented Nov. 12, 1889.

UNITED STATES PATENT. OFFICE.

GEORGE WARREN IVILSON, OF BOSTON, MASSACHUSETTS.

|NCAND ESCENT ELECTRIC LAM P.

SPECIFICATION forming part of Letters Patent No. 414,741, dated November 12, 1889.

Application filed January 24, 1889- Serial No- 297,356- (No model.)

To all whom it may concern.-

Be it known that I, GEORGE WARREN WIL- SON, of Boston, in the county-of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Incandescent Electric Lamps; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention is an improvement in incandescent lamps in which the filament is held within an air-tight globe and is in the form of a loop; and its object is to provide a reflecting-surface between the limbs of the filament, which shall break up and distribute the light in the most effective manner, and at the same time to prevent short-circuiting or bombardment between the filament-limbs, which is so destructive to the material of the filament.

My present invention consists of a hollow reflector located between the limbs of the filament and composed of transparentnonconducting material, such as glass, whereby the rays of light are notonly reflected from the convex surface of the reflector, but are also reflected and distributed from the interior concave surface of the said reflector.

I do not claim, broadly, herein a reflector interposed between the limbs of the filament, limiting my claims in this application to a transparent tubular reflector.

In another application, dated March 7, 1889, Serial No. 302,240, I have claimed", broadly, the placing of a reflector between the limbs of the filament, and consequently disclaim this broad subject-matter in this case.

In the accompanying drawings, Figure 1 represents a side elevation of the lamp partly broken away, and Fig. 2 a detail view of a modification.

In the drawings, A represents the globe of the lamp; B, platinum terminals of the wires which form, with the filament C, the arc of the lamp.

D is any suitable filling in the neck of the globe by which it is closed and the parts are held in place. In this filling is set rigidly a reflector or distribnter E for the light, which extends between the limbs of the filament,

and forms a reflecting-surface for the limbs upon both sides of the reflector. This relamp is illustrated.

flector must be of non-conducting material, in order that it may not impair the working of the lamp. Its surface must be adapted to reflect the light, and for this purpose any suitable or well-known material may be used, but it is either itself Wholly non-conducting or is insulated upon some non-conducting part of the reflector. The reflector is made preferably of glass; but mica may-be used, or other transparent materials which the skill of the workman would readily suggest. In shape it is made preferably round in cross-section, and, as shown in the figures, conforms approximately to the shape of the globethat is to say, it is made narrow or contracted as it approaches the neck of the globe. An excellent effect is produced by a plain glass reflector made hollow or tubular, and interposed in the manner described between the limbs of the filament. The glass in this case has smooth interior and exterior surfaces, all of which serve to break up and disperse the light and prevent the lightwaves from neutralizing each other to a very great extent. The reflector itself also serves as a support for the platinum terminals, if desired.

In the form shown in Fig. 2, which is a longitudinal section, a convenient mode of uniting the reflector and the globe of the In this the reflector is contracted, as above explained, and then expanded in this construction to form a neck I), which fits snugly within the neck of the globe, and may be fused, cemented, or otherwise secured thereto. At the enlargement of the neck of the reflector, at points indicated by a, perforations are made through which the platinum terminals pass, and thereby the neck of the reflector is made to serve as a support for these terminals and the filament thereon. Not only does the reflector thus break up and disperse and thus utilize all the rays or waves of light, but it also prevents what is called bombardment and short-circuiting, and greatly increases the usefulness of this class of lamps.

I claim as my invention 1. In combination with an incandescent electric lamp, a non-conducting transparent reflector in tubular form interposed between the limbs of the filament", snbstantinll; as de- In testimony whereofllmve signed my name scribed.

to this specification in the presence of. two snl 2. In combination with an incandescent scribing Witnesses. electric lamp, a n0n-c0ndncting transparent GEORGE \VARREN WILSON. 5 reflector interposed between the limbs of the Witnesses: filament andhaving diverging sides, substan- RUSSELL O. ELLIOTT, tially as described. JOHN W. PAR'JFRI'DGE. 

